export const dataURLtoFile = (dataurl, filename) => {//将base64转换为文件
    let arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
        bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
    while (n--) {
        u8arr[n] = bstr.charCodeAt(n);
    }
    return new File([u8arr], filename, {type: mime});
}

export const read_file_to_base64 = (file) => {
    let reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = function () {
        console.log(reader.result); //获取到base64格式图片
    }
}
